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with Variable Stroke.

745

corresponding adjustment of stroke.    The result is roughly the
same, for pressure x stroke = work done.

The cam F is peculiar in shape; it is shewn under full load,
having turned through three-quarters of a revolution, in a right-
hand direction. Its highest point is'at-f-, and its lowest at #,
and when the load is removed, the cam turns leftward until the
projection at * stops itself against the projection G. Similarly
the earn shewn dotted serves when the engine rotation is reversed,
the projection j being then acted upon. Both G and j are one
with the shoe-plate M, but lie in different planes, so that the two
cams, also in one piece, may rotate without interference.